本系统设计结合单片机STC89C51编程实现的遥控开关来控制家用电器，让人们用一台遥控器控制电冰箱、电风扇、饮水机等家电。本设计的核心是以单片机stc89c51，利用光电耦合器来检测小车的形式的速度和距离，利用led显示小车的运动的状态和行车里程，并且外加电磁蜂鸣器来警告已接收到遥控信号，本文着重介绍了该系统的硬件设计方法及软件设计的办法。-The system design coupled with the remote control MCU STC89C51 programming switches to control household appliances, allow people to use a single remote control refrigerators, electric fans, water dispenser and other home appliances. The core of this design is based on SCM stc89c51, the use of optical coupler to detect the form of car speed and distance, using the movement led display car status and mileage, and the external electromagnetic buzzer to warn has received remote control signal, this paper focuses on the system' s hardware design methods and software design approach.